Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dfc9c0bcc3a843…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 08:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 024249f70316136609f48bedef9b0d04 SHA-1: 37894f65027f6c7513df5a82a48d5517513338ef SHA-256: 86dfc9c0bcc3a843689607209c701139998bc429c22bda083ae69fbc1247c928
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161355386bd6e0---60139481488.pdf In PDF document text
    • https://pezenasenchantee.fr/userfiles/file/dobobi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/67ead2773e250eece0b7bf1b480f1954/mejomejalimofarekimoseji.pdfIn PDF document text
    • https://matrixx.lu/images/70019921547.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7f58ca79---49993980869.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/56859619776.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/fapixe.pdfIn PDF document text
    • http://datcat.vn/2018/file/88243370142.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910012517.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374eee1fbca---bojijisulezonovilego.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b97e0ee4669783691b390ae38435400f/77397535982.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiduxesarotikek.pdfIn PDF document text
    • http://freestyler.cz/img/file/21326032515.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/saluxunibozet.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/widoxepopegisit.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/nogomakukukeli.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/85811351125.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/mobinibe.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/zupiratomatalaluxujujipi.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/65887775038.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/592117539.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dowadixokup.pdfIn PDF document text
    • http://receptlap.hu/files/suvuvuzatogogarukulimuz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144f62b266d5---sodobanadufatirunutol.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/dovifetunup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=4k+video+player+pro+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F9 16796 bytes
SHA-256: 4e7bbd70c23d1eaee98e2727786e7fede7dc72ac0ec517f65add19b03e9a29e8
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 10268 bytes
SHA-256: 4ac7e6930482817653b059155d02183322e539aae041a2818de06f0a6be97b28
font_02_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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